// Cesium 加载高德矢量地图
var layer = new Cesium.UrlTemplateImageryProvider({
    url: "http://webrd02.is.autonavi.com/appmaptile?lang=zh_cn&size=1&scale=1&style=8&x={x}&y={y}&z={z}",
    minimumLevel: 4,
    maximumLevel: 18
});
// Cesium 加载高德影像
var imgLayer = new Cesium.UrlTemplateImageryProvider({
    url: "https://webst02.is.autonavi.com/appmaptile?style=6&x={x}&y={y}&z={z}",
    minimumLevel: 3,
    maximumLevel: 18
});
// Cesium 加载注记要素
var annLayer = new Cesium.UrlTemplateImageryProvider({
    url: "http://webst02.is.autonavi.com/appmaptile?x={x}&y={y}&z={z}&lang=zh_cn&size=1&scale=1&style=8",
    minimumLevel: 3,
    maximumLevel: 18
});
// Cesium 加载天地图
var dmap = new Cesium.UrlTemplateImageryProvider({
    url: "https://map.geoq.cn/ArcGIS/rest/services/ChinaOnlineStreetPurplishBlue/MapServer/tile/{z}/{y}/{x}",
    minimumLevel: 4,
    maximumLevel: 18
});
// viewer.imageryLayers.addImageryProvider(dmap);
function map1() {
    viewer.imageryLayers.addImageryProvider(layer);
};
function map2() {
    viewer.imageryLayers.addImageryProvider(imgLayer);
};
function map3() {
    viewer.imageryLayers.addImageryProvider(annLayer);
};
// map1();